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diff --git a/dol/src/dol/visitor/PNVisitor.java b/dol/src/dol/visitor/PNVisitor.java
new file mode 100644
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+++ b/dol/src/dol/visitor/PNVisitor.java
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+/* $Id: PNVisitor.java 1 2010-02-24 13:03:05Z haidw $ */
+package dol.visitor;
+
+import dol.datamodel.pn.Channel;
+import dol.datamodel.pn.Configuration;
+import dol.datamodel.pn.Connection;
+import dol.datamodel.pn.Port;
+import dol.datamodel.pn.Process;
+import dol.datamodel.pn.ProcessNetwork;
+import dol.datamodel.pn.ProfilingConfiguration;
+import dol.datamodel.pn.Resource;
+import dol.datamodel.pn.SourceCode;
+import dol.datamodel.pn.Variable;
+import dol.main.UserInterface;
+import dol.util.CodePrintStream;
+
+/**
+ * This class is an abstract class for a visitor that is used to
+ * generate a Process Network description.
+ */
+public abstract class PNVisitor implements Visitor {
+
+    public PNVisitor() {
+        _ui = UserInterface.getInstance();
+    }
+
+    public void visitComponent(ProcessNetwork x) { }
+    public void visitComponent(Resource x) { }
+    public void visitComponent(Process x) { }
+    public void visitComponent(Variable x) { }
+    public void visitComponent(Channel x) { }
+    public void visitComponent(Connection x) { }
+    public void visitComponent(Configuration x) { }
+    public void visitComponent(ProfilingConfiguration x) { }
+    public void visitComponent(Port x) { }
+    public void visitComponent(SourceCode x) { }
+
+    /**
+     *  Stream where the print output is sent to.
+     */
+    protected CodePrintStream _printStream = null;
+    protected UserInterface _ui = null;
+    protected String _delimiter = "/";
+}